海水
元古代
蓝藻
微生物垫
成岩作用
叠层石
胞外聚合物
地质学
生物圈
Acritarch公司
底栖区
石化
人工海水
环境化学
生态学
地球化学
海洋学
生物膜
碳酸盐
古生物学
化学
细菌
生物
哲学
有机化学
构造学
语言学
作者
Kelsey Moore,Jian Gong,Mihkel Pajusalu,Emilie J. Skoog,Megan Xu,Tania Feliz Soto,Víctor Sojo,Thomas Matreux,Matthew J. Baldes,Dieter Braun,Kenneth H. Williford,Tanja Bosak
出处
期刊:Geobiology
[Wiley]
日期:2021-05-12
卷期号:19 (5): 438-449
被引量:16
摘要
Abstract Microbial fossils preserved by early diagenetic chert provide a window into the Proterozoic biosphere, but seawater chemistry, microbial processes, and the interactions between microbes and the environment that contributed to this preservation are not well constrained. Here, we use fossilization experiments to explore the processes that preserve marine cyanobacterial biofilms by the precipitation of amorphous silica in a seawater medium that is analogous to Proterozoic seawater. These experiments demonstrate that the exceptional silicification of benthic marine cyanobacteria analogous to the oldest diagnostic cyanobacterial fossils requires interactions among extracellular polymeric substances (EPS), photosynthetically induced pH changes, magnesium cations (Mg 2+ ), and >70 ppm silica.
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